In February, Yahoo aggressively took back share from Google, returning to Jan 2006 levels. Digging into our largest 50 accounts, the average percentage change in Google ad spend from Jan ‘07 to Feb ‘07 was up 8%. Their average percentage change in Yahoo ad spend over the same period was up 24%

While two months don’t constitute a trend, and while the last two months don’t staunch the tremendous loss of share Yahoo suffered from Google over 2006, it is interesting to see that the arrival of Panama coincided with two upward months in ad spend share in Yahoo’s favor.

In a play for ad revenue, Google is making the world’s information slightly less universally accessible and slightly less useful. On December 5th, Google quietly stopped accepting new sign-ups for the Google SOAP Search API.

DonorsChoose is website which allows teachers to request mini-grants from donors, and donors to help fund those grants, though gift certificates and additional donations. Kudos to Yahoo for supporting this non-profit group, and in turn, supporting schools across the country.

If your company currently advertises using CSEs â€” or if your company is thinking about starting -â€“ the ARTS-NRF CSE standardization effort will help you. Here are four steps to support this initiative.

Standard data exchange formats designed to simplify online advertising were announced today in New York City at the annual convention of Shop.org, the online division of the National Retail Federation. These standard formats will allow advertisers to send detailed product-level information to search engines more efficiently.

SEM Pricing: Bundled Prices vs A La Carte. Are you better off buying services for SEM, CSE, Affiliate Management, and SEO all under one price structure, or buying each service separately? George Michie discusses the value of the a la carte model.